Specify the connection to the PostgreSQL cluster [DBZ-3714]

Migrated from [DBZ-3714](https://issues.redhat.com/browse/DBZ-3714)

ENV: PostgreSQL 12 on Patroni (2 node cluster)

How to specify a two-node connection? 

PostgreSQL driver supports jdbc url in this format: 

{{jdbc:postgresql://node1,node2,node3/accounting?targetServerType=primary}}.

 
|{{database.hostname}}| |IP address or hostname of the PostgreSQL database server.|

How to specify this in conf for Debezium Connector ???

Start by reviewing the PostgreSQL connector configuration and the JDBC URL format described in the issue, including Patroni's two-node setup. Determine whether the connector currently accepts multiple hosts and identify the relevant configuration entry point. Done means documenting or implementing a clear way to specify the PostgreSQL cluster and verifying the connection behavior.

Written by the indexing model from the issue text.